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89=13.5n+8
We move all terms to the left:
89-(13.5n+8)=0
We get rid of parentheses
-13.5n-8+89=0
We add all the numbers together, and all the variables
-13.5n+81=0
We move all terms containing n to the left, all other terms to the right
-13.5n=-81
n=-81/-13.5
n=+6
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